Portion of a luminaire



FIG. 1 is a perspective view of the new design for a portion of a luminaire as seen from the top, right side;

FIG. 2 is a right side elevational view, the left side view being a mirror image thereof;

FIG. 3 is a front elevational view, the rear elevational view being a mirror image thereof;

FIG. 4 is a right end elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines depicting portions of the luminaire in the drawing are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a portion of a luminaire, as shown and described. 